Glee

Like it, or despise it with the white-hot fury of a thousand collapsing suns, Fox’s show “Glee” remains a high-profile musical source for many, especially in the under-50 demographic. Its cover songs routinely show up on the iTunes charts, and as of last February, the cast of “Glee” was the eighth-best-selling digital artist of all time, according to SoundScan. They have also far surpassed the record for most charting singles on the Billboard Hot 100, which formerly belonged to Elvis Presley.

“Glee” is powered by covers, probably more so than its actual plot. People expect new arrangements and interpretations, and then snap them up on iTunes. But what happens when those attention-grabbing and sales-generating arrangements were not actually created specifically for the show? Does “crowdsourcing” arrangements — that have a good chance of charting — from musicians without permission or attribution run afoul of copyright?